Business and Summary of Significant Accounting Policies (Property & Equipment) (Details) (USD $)	12 Months Ended
	Dec. 30, 2014	Dec. 31, 2013	Jan. 01, 2013
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 24,787,000	$ 20,623,000	$ 16,719,000
Internal payroll costs capitalized	2,900,000	2,600,000	2,300,000
Interest costs capitalized	$ 400,000	$ 300,000	$ 300,000
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	20 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years